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25 Cards in this Set
- Front
- Back
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Which of the following is NOT related to a cell's ratio of surface area to volume?
a)cell size b)rate of growth c)number of nuclei d)efficiency of cell oxygen e)efficiency of cell nutrients |
c. number of nuclei
(has to do with mitosis) |
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Which family of proteins regulate the timing of the cell cycle?
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cyclins
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Which of the following is NOT a stage in mitosis?
a)anaphase b)metaphase c)telophase d)prophase e)interphase |
e. interphase
the "in-between" period between growth and division |
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_____ is the process of cytoplasmic division.
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Cytokinesis
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_____ is the process of the division of the cell nucleus.
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mitosis
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If a cell has 15 chromosomes, how many chromosome will each of its daughter cells have after mitosis?
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15 chromosomes
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Sister chromatids are attached to each other at an area called the ______.
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centromere
(meaning from part of) |
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What phrase of mitosis is where chromosomes are most visible?
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prophase
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External regulators direct cells to ________________.
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speed up or slow down the cell cycle
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How does a cell's DNA limit the cell's size?
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DNA is limited as to how much information it can transmit; once it reaches it's limit, the cell must divide.
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How are cell volume, cell surface area and the ratio of the two related.
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As a cell grows, its volume will increase faster than its surface area. Once the ratio of surface area to volume reaches a maximum, the cell must divide.
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What is the relationship between interphase and cell division?
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Interphase is the period of cell growth right before cell division.
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Summarize interphase.
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Interphase consist of:
1. G1 - cell growth 2. S - DNA copied 3. G2 - prepare for mitosis |
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Why is it important that cell growth in a multicellular organism be regulated so closely?
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Uncontrollable growth can cause serious medical problems in an organism.
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Describe the similarities and differences in a cancer cell and normal cell.
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They both have the same type of cell division process, but the cancer cell's division is not regulated.
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What phase?
Centrioles separate. |
prophase
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What phase?
Two nucleus envelopes form. |
telophase
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What phase?
The individual chromosomes move apart. |
anaphase
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What phase?
The nucleolus disappears and the nuclear envelope breaks down. |
prophase
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If a particular type of cell completes one cell cycle in 75 minutes, and you start with one cell, how many cells would be present after 7.5 hours.
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7.5 hrs x 60 = 450 min
450/75 = 6 |
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How do external regulators respond to events outside of the cell?
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Regulators will slow down the cell cycle if the environment is crowded, and speed the cycle up when space allows.
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Do all cells in the body have the same growth rate? Give examples.
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No, body cells have different life spans. Cell in the lining of the stomach live only for a few days, while nerve cells can live much longer.
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Describe a situation in the human body that would cause an increase in the rate of cell division, followed by a return to the normal rate of division.
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An injury or surgery would cause certain body cells to speed up the cell cycle in order to replace injured or missing cells.
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The M Phase is also known as ___.
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mitosis
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What phase of mitosis takes the longest period of time?
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prophase
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